Two alternative names for this card I thought might work: "Doublecast" and "Channeling." The first, naturally, comes from Final Fantasy; the second comes from my Neverwinter Nights days. On my server, a sorcerer could choose to expend 2-4 charges of a given spell instead of only 1, in exchange for more spell penetration and difficulty class on the spell. "Clearcasting" is also good, but probably too evocative of World of Warcraft for some people.
Good card concept, I think it's been done before but not quite this way. In other news, WHY do I keep seeing card ideas that inspire me to create something that would be close enough to the original as to be offensive and intrusive??